Motor-controller.



H. W. CHENEY.

MOTOR CONTROLLER.

APPLICATION FILED FEILZQ, 1908.

931,384. Patented Aug. 17, 1909.

HIIIIHIIII It] llllllllllllillllm 14 I A l 'stop. The striking ofthc'soring-prcssed UNITED STATES PATENT OFFICE.

CORPORATION OF NEW JERSEY.

HERBERT W. CHENEY, 0F NORWOOD, OHIO, ASSIGNOR TO'ALLIS-CHALMERS COMPANY,A

Specification of Letters Patent;

MOTOR-CONTROLLER.

Patented Aug. 17, 1909.

Application am February 29, 1908.1 Serial No. 413,445.

To all whom it may concern:

' Be it known that I, Hennnn'r W. Gunner, citi'x'cn of the UnitedStates, residing at Nor wood, in the county of Hamilton and State ofOhio, have invented certain new and useful Improvements inMotor-Controllers, of which the following is a full, clear, andexactspccification;

My invention relates to controllers for electric motors and particularlyto foolproof potential starters'for induction motors.

-,In my Patent No. 8%,446, granted August 27"., 1907,.there isdescribeda potential starter for/induction motors in which arotatabledrum cooperates with fixed contact fingers and is, normally movablealways in the same direction, means being provided whereby backwardmovement ofthe controller drum from olf'or running position is reve'ntedand whereby the controller will e moved backward to off osition if it isreleased in any starting position. 'With this controller it isimpossible for an operator, how careless or inexperienced soever, toleave the controller in a starting position indefinitely instead ofmoving it to running position as soon as the motor has gained sufficientspeed, and thusthe autotransformer windings which are in circuit onlywhen the control or is instarting position and which-.are proportionednot to carry current continuously but only for the brief perioduringstarting,r arereserved from ong' c ntinned currents. at in the device asoriginally constructed, the means tending to more the com-rollerhackward to off position when in starting position comprised a sprin' 5pressed arm which engaged a part moral) ewith the controller dnum fromthe time tho/latter left off position until it reached stiirtinposition, during this time tending to pal the con troller drum backwardto olf position andnnti'l the arm itself struck a stop. When thecontroller reached the running position the arm was disengaged frhm' thepart with which it was previously iniengagen'lcnt and was moved back bya spring against said ar'm. against the stop produced a considerablejwr.

'l tiis the object of my present invention to avoid this jar or shock,andthis object I have obtained by doing away with the stop four thesawingarmed arm. Specifically, the spifing, which is a tension spring,is allowed to not until it is in line with the pivotal point of the arm.

The various'finovel features of my invention will appear hereinafterand. will he particularly pointed out in the claims.

Figure 1 is a front elevation ofthe controller operating mechanismconstructed in accordance with my invention, the parts being in. oilposition and partly broken away; Fig. is a somewhat similar view,showing the parts just before they reach the running wsition; Fig. 3 isa side elevation. of the operatingmechanisln showing part of thecontroller, the controller casing and some of the other parts being insection; and Fig. 4 is a partial section through the operating handle.

Within the controller casing 10 is a controller drum A of any desiredconstruction. The operating mechanism here shown is Iespeciall designedfor controller drums having uplicate halves, which respectivelycooperate with two diametrically opposite sets of contact fingers-duringone complete operation of the contro ler and with the op-- positesetsduring the next complete 0 craition th'f'e'df. Such a controllerhas, uplicute oil, starting, and running positions. The controller hereshown passes through but one-starting position between oil" and runningpositions, though any desired number of starting positions may be uscdl.In the arrangement shown analogous positions are 180 apart. Theparticular construction and arrangement of thc controlling drum,however, orms no part of my present invention and is applicable tocontrollers having one off and one running position with any desirednumber of starting posi tions between them.

' The controlling drum A is driven from an operating shaft 11 in anydesired manner, as through gears 12. The shaft 11 isjouinaled in ahearing 13, here shown as integral with the upper part of the frainc l0.Mounted on th outer end of the shaft 11 is the operating handle 14,which is secured at its center to the shaft and )rovided with two handgri s 15 and 16. s here shown the handle is aorizontalwhen thecontroller is in oil position. Integral with the frame 10 andsurrounding the shaft 11 and bearing 13 is a notched ring 19, thenotches of which are adapted to be engaged hy'a sliding pawl or plunger23 pressed radially into engagement the sprin to the 0 therewith by aspring 24. The plunger 23 is mounted on an extension 25 from the handle14, which also carries pointers to in- (.llttltfl the positions of thecontroller. In the ring 19 there is one pair of notches 20 and 20' whichextend from the olf to the starting positions, and another pair ofnotches 22 and 22*which mark the running position of the controller. Thering 19 is so constructed that ratchet teeth are formed between thevarious notches to revent backward movement of the control er.

Loosely mounted on the shaft 11 is an arm 27, on the outer end of whicha second arm 28'is pivoted and pressed inward against the stop 29 bymeans of the spring 80. The arm 28 carries at its free end a roller 31,which when the arm 28 is pulled inward is in the path of two lugs 32 and32 carried by the upper gear 12 but which can be pressed outward by acam 33 on the casting 10 so that it will clear the'lu 32 and 32. Anadjustable tension spring 5 is attached to a-boss 36 on the arm 27 andtends to return said arm to the 011' position, the spring being in linewith the pivotal point of the arm when the latter is in such offposition. The fixed end of the spring 35.is attached by the adjustingscrew 35 to a bracket 38 extending downward irom the casting 10 and alsoforming a bearing for the drt'lm A. When the controller is in offposition 0 the parts are as shown in Fig.1, By mov ing the handle 14 ina clockwise direction the controller drum A ma starting position S, whent e pawl 23 will strike the clockwise end of the notch 20' or 20 so thatthe operator may feel when this startin position is reached. In thismovement tie lug 32, through the roller 31 and arms 28 and 27, hasextended the s rin 35 to some extent. -If the operators 0111 now releasethe handle, the spring '25 will contract and pull the drum back to 05osition, thus preventing the controller rom being left without care inthe starting posi-. tion. But if the operator does not re ease thehandle when the co t-roller is in starting position, but after'asufiicient time moves the controller farther in a' clockwise directionit will pass through the position shown in I ig, 2 into the runningposition R. The position indicated in Fig, 2 shows the parts ustbeforethe running position is reached. [f the controller is released atany-point until the position shown in Fig. 2 is reached, 35 will movethe controller back position. As the controller a proaches the runningposition, however, t 1e roller 31 strikes the ram 33. and is movedoutward as shown in Fig. 2 until it clears the lug 32, whereupon the sring 35 will pull the arms.27 and 28 and rol er 31 back to the positionshown in Fig, 1-. These parts are actually moved furthercounter-clockwise be moved .to'

than shown, but will return and pass repeatedly through the positionshown in a line of the spring 35 intersecting the axis of the shaft 11.

The pawl 23 and notch 21 or 21* prevent backward or counter-clockwisemovement of the drum from the running position. When it is desired tostop the motor the controller is moved farther in a clockwise directionto oil position, when the plunger 23 dro )S into one of the notches 20or 20 and bachward movement is'again prevented.- 'From this oil positionthe? operation above. do scribed may be re eated, thou hin this.operation the controller drum 1111f its operating parts are indiametrically opposite positions from. those of the previous operation.

Many modifications in the precise arrangement shown and described may bemade without departing from the sgirit and scope of my invention and allsuch aim to cover in the following claims.

What I claim as new is 1. A starting controller for electric n10- tors,comprising fixed and movable membars, a spring-pressed arm, means forcarrying said arm out of its normal position as the movable member ismoved from oil' position, and means for releasing said arm from saidmovable member when the latter approaches running position, saidspringressed arm being constructed and arranged to returnto andsteg atits normal position by the action of its spring.

2. In astarting control er for-electric motors, the combination of arotatable drum having 011', starting, and runnin positions; an arm whichis spring-presse toward a normal position when on either side of suchposition, and means whereby on movement of said drum between 011' andrunning positions said arm is moved out of its normal position and tendsto return said drum to oil position.

3., A controller for electric motors, comprising a rotatable drum havingofi', start mg, and running positions, a spring which tends to move thecontroller back to oil pomeans for releasing said drum from the springwhen the running position is reached, said spring bein arrangrd toreturn to and stop at its norma position by its own action. 4. In acontroller for electric motors, the combination of a rotatable drumhaving oil, starting, and running positions, and a spring-pressed armthrough which the con troller is biased to oif position when n startirigposition but is unbiased when in run ning position, said sprin -pressedarm being arranged when relea to return to an stop at its normalposition by the action of its spring.

gradua ly decreasing arc until they come to rest in the position shownwith the center sition when it is in a starting position, and i 5. In acontroller for electric motors, the combination of a rotatable drumhaving ofi', starting, and running positions, an arm, means for carryingsaid arm out of its normal position by movement of said drum betweenofl' and running positions, means for releasing said arm from said drumwhen the latter reaches running position, and a spring which tends toretnrn said arm to its norma position whenever it is in some otherposition and also acts as a buffer when the arm is returned to itsnormal position after having been released from said drum.

6. In a starting controller for electric motors, the combination offixed and movable members, an arm, a helical sprin attached to the arm,said arm and spring ing normally in a position with the axis of thespring in line with the pivotal point of the arm, and means whereby saidarm is forced out of said normal position as said movable member ismoved from ofl position but is released to return to such normalposition as said movable member approaches running position.

7 In a starting controller for electric motors, the combination of arotatable drum, an arm acted on by a tension sprin and normally inposition with the axis 0 the tension spring intersectingthe axis aboutwhich the arm turns, means whereby said drum as it is moved forward fromoff osition dis places said arm and is thereby iased backward to offposition, and means whereby said arm is disen aged from said drum whenthe latter reac ies a predetermined position.

In testimony whereof I afiix my signature, in the presence of twowitnesses.

HERBERT W. CHENEY.

Witnesses Gno, B. Sonmr, FRED J. KINsEY.

